diff --git a/backend/service/services.py b/backend/service/services.py
index 39a6b1a..dbeb840 100644
--- a/backend/service/services.py
+++ b/backend/service/services.py
@@ -11,7 +11,7 @@ class TribeDosNotExists(Exception):
     pass
 
 
-def add_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
+def add_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn) -> Tribe:
     tribe = Tribe(name=name, level=level)
     try:
         tribe_repo.add(tribe)
@@ -21,7 +21,7 @@ def add_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
     return tribe
 
 
-def update_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
+def update_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn) -> Tribe:
     tribe = Tribe(name=name, level=level)
     try:
         tribe_repo.update(name=name, tribe=tribe)
@@ -29,3 +29,12 @@ def update_tribe(name: str, level: str, tribe_repo: AbstractRepository, conn):
         raise TribeDosNotExists(f"The tribe {name} does not exists you can't update it")
     conn.commit()
     return tribe
+
+
+def delete_tribe(name: str, tribe_repo: AbstractRepository, conn) -> None:
+    try:
+        tribe_repo.delete(name=name)
+    except TribeRepositoryError:
+        raise TribeDosNotExists(f"The tribe {name} does not exists you can't delete it")
+
+    conn.commit()
diff --git a/tests/unit/test_service.py b/tests/unit/test_service.py
index 0a87ef5..523e856 100644
--- a/tests/unit/test_service.py
+++ b/tests/unit/test_service.py
@@ -40,7 +40,7 @@ class FakeTribeRepository(AbstractRepository):
         try:
             self._tribes.pop(name)
         except KeyError:
-            raise KeyError(f"The tribe {tribe} does not exists")
+            raise TribeRepositoryError(f"The tribe {name} does not exists")
 
 
 class FakeStudentRepository(AbstractRepository):
@@ -140,3 +140,26 @@ def test_update_tribe_fail_not_exists():
         )
 
     assert conn.committed == False
+
+
+def test_delete_tribe():
+    tribes = build_tribes(3)
+    tribe_repo = FakeTribeRepository(tribes)
+    conn = FakeConn()
+
+    tribe = tribes.pop()
+    services.delete_tribe(name=tribe.name, tribe_repo=tribe_repo, conn=conn)
+
+    assert conn.committed == True
+    assert set(tribe_repo.list()) == set(tribes)
+
+
+def test_delete_tribe_fail_not_exists():
+    tribes = build_tribes(3)
+    tribe_repo = FakeTribeRepository(tribes)
+    conn = FakeConn()
+
+    with pytest.raises(TribeDosNotExists):
+        services.delete_tribe(name="azerty", tribe_repo=tribe_repo, conn=conn)
+
+    assert conn.committed == False